diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f7caa07..c739414 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,6 +1,10 @@
 name: CI
 
-on: [push]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
 
 jobs:
   build:
@@ -8,7 +12,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macOS-latest]
-        php-versions: ['7.4']
+        php-versions: ['7.4', '8.0']
 
     name: Test on ${{ matrix.os }} with PHP ${{ matrix.php-versions }}
     steps:
diff --git a/composer.json b/composer.json
index dde6002..03fee40 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
     }
   ],
   "require": {
-    "php": ">=7.4"
+    "php": "^7.4||^8.0"
   },
   "require-dev": {
     "squizlabs/php_codesniffer": "^3.5",